fix(app): Added proper encoding to avoid app crashes while downloading files. Fixes: RCCE-37

rhodecode/apps/repository/views/repo_files.py

@@ -808,10 +808,12 b' class RepoFilesView(RepoAppView):'
         safe_path = f_name.replace('"', '\\"')
         encoded_path = urllib.parse.quote(f_name)
 
-        return "attachment; " \
+        headers = "attachment; " \
                "filename=\"{}\"; " \
                "filename*=UTF-8\'\'{}".format(safe_path, encoded_path)
 
+        return headers.encode().decode('iso-8859-1', errors='replace')
+
     @LoginRequired()
     @HasRepoPermissionAnyDecorator(
         'repository.read', 'repository.write', 'repository.admin')